Fix unit test for python 2.7

beem/blockchain.py

@@ -867,7 +867,7 @@ class Blockchain(object):
 
             >>> from beem.blockchain import Blockchain
             >>> blockchain = Blockchain()
-            >>> blockchain.get_similar_account_names("test", limit=5)
+            >>> print(blockchain.get_similar_account_names("test", limit=5))
             ['test', 'test-1', 'test-2', 'test-ico', 'test-ilionx-123']
 
         """